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What is langgraph built with?

langgraph is a Python repo. It stores its data in Postgres, SQLite, and sqlite-vec, uses AI through LangGraph, LangChain, langgraph-sdk, and langchain-protocol, validates its data with Pydantic, and uses aiosqlite, psycopg, and psycopg-pool. It has 206,994 written lines, with 247 test files.

Read on November 6, 2026, at commit 5847733. Read it as markdown

Backend

Data 6

AI 4

Support

Validation 1

Tools 2

  • click10 files
  • pathspec3 files

Other 7

  • websockets3 files
  • httpx20 files
  • orjson12 files
  • xxhash2 files
  • ormsgpack1 file
  • python-dotenv1 file
  • tomli1 file

Other repos with a similar stack

Ordered by how much of its stack they share with langgraph, then by stars.

Frequently asked questions

What language is langgraph written in?
langgraph is written in Python, with 206,994 written lines.
What database does langgraph use?
langgraph stores its data in Postgres, SQLite, and sqlite-vec.

The proof: libs/checkpoint-postgres/langgraph/checkpoint/postgres/__init__.py, line 22

Does langgraph use AI?
Yes. langgraph uses AI through LangGraph, LangChain, langgraph-sdk, and langchain-protocol.
What services does langgraph use?
langgraph uses aiosqlite, psycopg, and psycopg-pool.
Does langgraph have tests?
Yes. langgraph has 247 test files.
Which repos have a stack like langgraph's?
The ones that share most of its stack:datawhalechina/hello-agentsmem0ai/mem0run-llama/llama_index

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